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On the Bristol Copper Mine. : 361 
pled by migration from specific centres specially segected for this ~ 
end. If. such centres had ‘an existence, there is”at present no 
. by eri which is most favorable to its developm ent: 
_. Should thus conclude that the Ranina dentata, for one was ~ 
created in the subtorrid region and not the torrid, as it attains its 
largest size in the ine er. By pursuing this course with reference 
to each species, we may find some that are especially fitted for 
almost every diferent locality. Hence, we might show, as far 
as reason and observation. can do it, that all regions have had 
their own special creations. 
The world heen all its epochs in past history, has been 
furnished with life accordance with the times and seasons, 
each species: being ada to its age, its place, and its fellow spe- 
cies of life.* 
Arr. XX XIII.—Notice of the Geological position and character 
of the Copper Mine at Bristol, Bae edd by Professors 
B. Sutumay, Jr., and J. D. Wuirtney.t 
Situation.—T his well known mine is situated in the north 
e 
the Station House of the Hartford and Fishkill Railroad is located. 
e persevering enterprise with which this mine has been ex- 
plored, the rich character of its ores, the extent and costliness of 
its former workings, and the general impression, lately much 
Nor is its economical value diminished by the scientific interest 
attaching to the peculiarly complex nature of the eposi 
Geological position and nature of the deposits.—This mine is 
worked in a “contact deposit,” between the sandstone of the 
Connecticut River Valley, now supposed by geologists to be of 
Liasic age, and the older metamorphic rocks, commonly called 
primary, “but in all probability of the paleeozoic system. 
The direction of the line of contact of the two formations at 
the mine is about NE an 
acts in this Journal from the author's ae relating to the Geo- 
graphical ‘Distribution of Crustacea, which are here concluded, are contained in vol- 
umes xvi, xviii, xix and xx. The map illustrating the subject of Oceanic tempera- 
ture, the Zones and et Provin ei is in volume ar 
This article is taken from a “Report of an examination of the Bristol vy <i 
Mine in Bristol, Co i b Profesor B. Silliman, Jr., and J, D. Whitney, Aug., 18 
New Haven: ibution,? 
Szconp Suaus, val st i 0. vt —Novy., 1855. , 46 
